case insensitive matching search in string array swift 3

Question

In Swift 3, I want to create an array of matching string (case insensitive) from string array:-

I am using this code, but it is case sensitive,

let          


        

Answer 1

Answer 2020:

Even I put Chinese or Arabic, below test codes still returns TRUE

let text = "total sdfs"
let text1 = "Total 张"
let text2 = "TOTAL لطيف"
let text3 = "total :"
let text4 = "ToTaL : "



text.lowercased().contains("total")
text1.lowercased().contains("张")
text2.lowercased().contains("لطيف")
text3.lowercased().contains("total")
text4.lowercased().contains("total")


text.localizedCaseInsensitiveContains("total")
text1.localizedCaseInsensitiveContains("张")
text2.localizedCaseInsensitiveContains("لطيف")
text3.localizedCaseInsensitiveContains("total")
text4.localizedCaseInsensitiveContains("total")